(Fig 2-B.19) Low-grade Partial tears of the ACL

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✅Understanding ACL Partial Tears 

1. Partial ACL Tears: 

• Partial ACL tears account for 15% of all ACL injuries, presenting a diagnostic challenge. 
• MR imaging accuracy rates for detecting partial tears range from 25% to 53%. 
• The difficulty is distinguishing between partial and complete tears and accurately defining bundle involvement.

 

2. Risk of Developing ACL Insufficiency

• The likelihood of developing ACL insufficiency closely correlates with the severity of the injury. 
• An injury involving more than 75% of the ligament significantly increases the risk, with chances exceeding 85%. 
• Conversely, injuries affecting less than 25% of the ligament present a much lower risk, around 12%. 
• Interestingly, secondary signs of ACL injury appear in both 'high-grade' (67%) and 'low-grade' (33%) partial tears, suggesting that these indicators alone may not suffice in differentiating between the severities of ACL tears.

 

3. Complete Tear Versus Mucoid Degeneration of the ACL 

• Mucoid degeneration can mimic partial ruptures, potentially leading to diagnostic inaccuracies. 
• Features such as a celery stalk appearance and the presence of ganglion cysts, both associated with mucoid degeneration, can aid in distinguishing between these conditions.

 

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